John nicholas floyd and david home morton



(No Model.)

J. N. FLOYD & D. H. MORTON. COMPOUND PUMPING ENGINE.

No. 439,579. Patented Oct. 28; 1890.

' IZZY/672707.15 W

UNITED STATES PATENT OFFICE.

JOHN NICHOLAS FLOYD AND DAVID HOME MORTON, OF HANDSIVORTH,

ASSIGNORS TO TANGYES, LIMITED, OF SOHO, ENGLAND.

COMPOUND PUMPING-ENGINE.

SPECIFICATION forming part of Letters Patent No. 439,579, dated October 28,1890.

Application filed July 5, 1890. Serial No. 357,753, (No modeL) To all whom it may concern.-

Be itknown that we, J OHNNIOHOLAS FLOYD and DAVID HOME MORTON, mechanical engineers, subjects of the Queen of Great Britain and Ireland, and residing, respectively, at Cornwall Cottage, Murdock Road, Hands- Worth, in the county of Stafford, England, and

controlling the slide-valves bf the low-press" ure cylinder or cylinders of the said pumping-engines by means of motive fluid from the high-pressure cylinder.

The invention may be used with engines operated by either steam or air; but for simplicity of description we will describe it as applied to a steam pumping-engine, from which its application to engines operated by air will also be understood.

The high-pressure steam-cylinder and its appliances may be of any ordinary construction suited for the application of this invention-such, for instance, as that used in the pump known as Tangyess Special Pumpand we will describe, with reference to the accompanying drawing, (which is a longitudinal vertical section,) the application of the invention to a pump of that kind, from which its application to pumps of other descriptions will also be understood.

A is the high-pressure cylinder, and B is the low-pressure cylinder. The slide-valve O of the low pressure cylinder B is not mechanically connected with, but is independent of, the valve of the high-pressure cylinder, and is operated by a piston D, working in an auxiliary steam cylinder E, preferably in line with the valve 0 of the said low-pressure cylinder B, which may receive its steam from the high-pressure cylinder in the usual or any convenient way. The ends of the said auxiliary steam-cylinder E are connected by means of pipes F and G or equivalentsteamways to .the steam ports or ends of the high pressure steam-cylinder A, as shown. The slide-valve C in the steam-chest of the low-pressure steams cylinder B may be of the D or other type, and the said slide-valve is fitted with piston-valves H II, the pistons of which work in short cylinders J J at opposite ends of the steam-chest, and the piston D is connected to one of the said piston-Valves II by the rod (1. i

In the arrangement illustrated we use the piston-valves H H in the steam-chest of the low-pressure cylinder B for controlling the motion of the piston D of the auxiliary cylinder E in the following manner: Each end of the steam-chest where the pistons H H of the slide-valve 0 work is provided with an auxiliary port K, which auxiliary ports connect the ends of the steam-chest J J in which the slide-"alve pistons H H work with the interior of the steam-chest in which the slidevalve 0 works. The auxiliary ports K K described may be capable of being opened and closed and regulated by means of screwed plugs or valves L L. By means of the said auxiliary ports K K in the steam-chest the space between the back of each of the pistonvalves H II of the slide-valve C and the end of the steam-chest J J in which it works is charged with steam, and when the piston D of the auxiliary cylinder E is moved by the steam entering its cylinder by the pipes F G, or steamways in connection with the highpressure cylinder A, the steam is compressed 'in one or other of the spaces J J at the ends of the low-pressure steam-chest, so as thereby to cushion the slide-valve piston and retard the motion of the auxiliary piston D. By these means the main pistons in the high and low pressure cylinders A and B are caused to make a pause at the ends of their strokes, thereby permitting the pump-valves to seat themselves quietly on their seats.

we do not limit ourselves to this arrangement for controlling or retarding the action of the auxiliary piston D, as in place thereof an oil, water, or air cylinder may be used, the displacement of the oil, water, or air in the said cylinder by the motion of the piston effecting the retardation of the slide-valve C, as hereinbefore described; or the retardation of the motion of the low-pressure slide-valve C may be effected by regulating the supply of steam to the auxiliary cylinder by placing stop-valves M M in the pipes F G, by which the said auxiliary cylinder E is connected with the steam ports or ends of the highpressure steam-cylinder.

In a compound pump or pumping-engine with more than two cylinders the low-pressure cylinder aforesaid would become an intermediate cylinder having; its valve actuated by steam, as described, and the slide-valve of the third cylinder would be connected with the ports or ends of the intermediate cylinder and be operated by steam, as described, with respect to the low-pressure cylinder of a twocylinder compound pumping-engine. In the same manner the .invention may be applied to a fourth cylinder, if desired.

\Ve wish it to be understood that We do not limit ourselves to the precise details hereinbefore described with reference to the accompanying drawing, as they may be varied Without departing from the nature of this invention.

We claim as our invention- 1. In a compound pumping-engine, the combination of the valve of a high-pressure eylinder with a low-pressure-cylinder valve mechanically independent of the high-pressurecylinder valve and passages leading from the high-pressure cylinder or its ports to supply motive fluid to operate the low-pressure valve, substantially as described.

2. In compound pumping-engines, the c0mbination of the valve of a high-pressure cylinder with the valve of a relatively low-pressure cylinder, a piston controlling the lowpressurecylinder valve mechanically independent of the high-pressure-cylinder valve, and passages leading from the high-pressure cylinder or its ports to supply motive fluid to operate the said piston of the low-pressurecylinder valve, all substantially as described.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

JOHN NICHOLAS FLOYD. DAVID HOME MORTON. Witnesses:

W. H. Hovvsn, Cornwall Works, Birmingham,

CHAS. H. J ESTER, Blake Lane, Yardly Road, Birmingham.

Both Clerks to Tamgyes, Limited. 

